WordPress offers a filter hooks to allow the plugins to modify various types of internal data at run time. It hook a function or method to a specific filter action and then call the functions added to a filter hook. Here we are going to explain you about the difference between Add_Filter and Apply_Filters.

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about Difference between add_filter() and apply_filters()

The difference between include vs. include_once and  require_once vs. require is obvious from the names. include and require allows you to insert a file multiple times within a single executions lifetime. While, include_once() and require_once() make sure one file is inserted only once in a single execution lifetime. The “include” statement is used to include other files into a PHP file. The “require” statement is used to include file.

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about WordPress include()/include_once() and require()/require_once()

In WordPress, both are used to retrieve or displays page and post title but the difference between them is that the wp_title() displays title for all areas while the_title() displays only the page title.

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about Difference between wp_title() and the_title()

In WordPress , the shortcode API works in a very simple way. If you want to create shortcode in wordpress then just follow these instructions carefully.
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about How to Create Shortcode in WordPress